CN1135715C - Transmitting circuit and no need radiated wave suppressing method - Google Patents
Transmitting circuit and no need radiated wave suppressing method Download PDFInfo
- Publication number
- CN1135715C CN1135715C CNB011407883A CN01140788A CN1135715C CN 1135715 C CN1135715 C CN 1135715C CN B011407883 A CNB011407883 A CN B011407883A CN 01140788 A CN01140788 A CN 01140788A CN 1135715 C CN1135715 C CN 1135715C
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- Prior art keywords
- amplifier
- signal
- output signal
- need
- band
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0483—Transmitters with multiple parallel paths
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Transmitters (AREA)
Abstract
A transmission circuit includes first and second amplifiers, a bandpass filter, a phase adjuster, and a signal combiner. The first and second amplifiers independently amplify input signals in different transmission frequency bands. The first amplifier in the ON state produces an unnecessary radiant wave in a frequency band substantially coinciding with the transmission frequency band of the second amplifier in the OFF state. The bandpass filter extracts a component in the same frequency band as that of an unnecessary radiant wave leaking out from the second amplifier during operation of the first amplifier. A phase adjuster adjusts the phase of an output signal from the bandpass filter such that the phase of the output signal from the bandpass filter becomes opposite to that of an unnecessary radiant wave in an output signal from the first amplifier. The signal combiner combines an output signal from the phase adjuster with the output signal from the first amplifier.
Description
Technical field
The present invention relates to have the radiating circuit of a plurality of different emission band amplifiers, relate more specifically to the radiating circuit of the no need radiated wave that can rejective amplifier produces during operation, the invention still further relates to the method for corresponding inhibition no need radiated wave.
Background technology
Current, at moving communicating field, along with being extensive use of of terminal, traffic carrying capacity obviously increases, and exists frequency band to differ great a plurality of system.For improving user friendliness, need a kind of terminal that can accept service separately from these systems.Under this environment, but but according to cost and erection space an omnibus circuit with a plurality of frequencies of utilization is installed and is preferable over and is installed in the frequency of utilization aspect and differs great a plurality of circuit.This is obvious, because market also needs to reduce terminal size.
For satisfying market demand, a kind of mobile communication terminal has been proposed in the prior art, wherein installed and played the radiating circuit that the power amplifier effect has a plurality of emission bands.This radiating circuit is made of a plurality of electronic circuits that have emission band optimization separately in a semiconductor die.For this reason, when an electronic circuit when certain emission band transmits, another electronic circuit on different emission bands may be subjected to just using the influence of electronic circuit.
Particularly, when a given emission band during near another emission band twice, the second harmonic that amplifier produces in the lower band is consistent with the desired frequency of amplifier in the high frequency band.The second harmonic that therefore can not suppress amplifier in the high frequency band basically.For this reason, when the work of lower band amplifier and high frequency band amplifier when not working is considered from all mobile communication terminals, unwanted radiated wave with trace but still very important amount from launching the output circuit of idle high frequency band amplifier.
For suppressing this unwanted radiated wave, double frequency-band radiating circuit has as shown in Figure 2 been proposed.With reference to Fig. 2, reference number 11 is represented an amplifier of GSM (Global Link) 900 (890 to 915MHz); 12 represent an amplifier of DCS (Digital Cellular System) 1800 (1710 to 1785MHz); 13 represent the low pass filter (LPF) of GSM900; 14 represent the LPF of DSC1800; 15 represent an antenna multicoupler; With 16 represent an antenna.In circuit shown in Figure 2, LPF13 and 14 is connected respectively to the output stage of amplifier 11 and 12 to suppress for example harmonic components of no need radiated wave.
In conventional two-band radiating circuit,,, produce the interior fluctuation of frequency band and signal attenuation in emission band, occurs because LPF is directly connected to the output of each amplifier.In addition, the load characteristic instability of amplifier.Although Fig. 2 has represented to have the two-band radiating circuit of two emission bands, similar problem appears in the radiating circuit with three or more emission band amplifiers.
Summary of the invention
The purpose of this invention is to provide a kind of radiating circuit, this circuit can suppress no need radiated wave and low pass filter is not connected to the output of each amplifier.Another object of the present invention provides the method for corresponding inhibition no need radiated wave
For achieving the above object, according to the present invention, a kind of radiating circuit is provided, it is characterized in that comprising: first amplifier and second amplifier, be used for the independent input signal that amplifies different emission bands, described first amplifier produces unwanted radiated wave in a frequency band under conducting state, this frequency band is identical at the emission band under the off state with described second amplifier; Band pass filter is used in the same frequency band of the no need radiated wave that leaks out from described second amplifier, extracts a composition from the output signal of described first amplifier; Phase regulator, the phase place of output signal that is used to regulate described band pass filter is so that opposite with phase place from the no need radiated wave of the output signal of described first amplifier; With the signal combiner, be used for and merge from the output signal of described phase regulator and output signal from described first amplifier.
Foregoing circuit may further include: power divider, and be used for and will carry out demultiplex from the output signal of described second amplifier to export one first signal and a secondary signal, described first signal will be provided for described band pass filter; A low pass filter is used for from extracting desirable signal from the secondary signal of described power divider output; And antenna multicoupler, be used for selectivity and export one of output signal from described signal combiner and described low pass filter.
The present invention also provides a kind of method that suppresses no need radiated wave, it is characterized in that comprising step: the emission band that first amplifier and second amplifier are set is so that consistent at the emission band under the off state with second amplifier at the frequency band of the no need radiated wave of first amplifier generation under the conducting state; In the frequency band identical, from the output signal of first amplifier, extract a composition with the frequency band that leaks out no need radiated wave from second amplifier; The phase place of regulating the signal component that extracts is so that opposite with the phase place of no need radiated wave in the output signal of first amplifier; With with signal after the phase adjusted with merge from the output signal of first amplifier.
Said method can also be included in the second amplifier duration of work is extracted desired signal by the output signal of demultiplex from second amplifier step.
Description of drawings
Fig. 1 is the block diagram of expression according to two-band radiating circuit design of the present invention; With
Fig. 2 is the block diagram of the conventional two-band radiating circuit design of expression.
Embodiment
Describe the present invention with reference to the accompanying drawings in detail.
Fig. 1 represents the two-band radiating circuit according to the embodiment of the invention.Two-band radiating circuit shown in Figure 1 comprises that amplifier 1 and 2 is used for amplification input signal, a power divider (splitter) 3 is used to receive the output from amplifier 2, a band pass filter (BFP) 4 is used to receive the output from power divider, phase regulator 5 is used to receive the output from BPF4, signal combiner 6 is used to receive the output from amplifier 1 and phase regulator 5, LPF7 is used to receive the output from power divider 3, an antenna multicoupler (output device) 8 is used to receive from the output of signal combiner 6 and LPF7 and antenna 9 and is used to receive output from antenna multicoupler 9.In this design, the signal that is input to amplifier 1 and 2 is exaggerated and is transferred to this antenna 9.
Amplifier 1 and 2 amplifies input signal and the output amplified signal of having optimized desired frequency respectively.It almost is the twice of amplifier 1 that the desired frequency band of amplifier 2 is arranged to.The frequency band of GSM900 is 890 to 915MHz, and the frequency band of DCS1800 is 1710 to 1785MHz, and therefore, amplifier 1 and 2 is used separately as GSM900 and DCS1800.
Power divider 3 is exported to BPF4 and LPF7 from the output signal of amplifier 2 and with the signal that produces along separate routes with predetermined any power ratio.BPF4 allow in the predetermined frequency band signal by and other signal of decaying.5 of phase regulators are offset the input signal phase place of BPF4 output arbitrarily and keep its frequency.
Signal combiner 6 merges the output signal power amplitude of amplifier 1 and the power magnitude of phase regulator 5 output signals, and the signal of output generation.Therefore, merged if having the signal of same magnitude and opposite phase, they are offset.LPF7 allows to pass through from the output signal with frequency identical or lower with characteristic frequency of power divider 3, and decay has the signal than specific frequency higher frequency.
The output signal that antenna multicoupler 8 allows signal combiner 6 in amplifier 1 and 2 desired frequency bands and LPF7 by and decay be not signal component in the frequency band of desired frequency band.
The work that then description is had the double frequency-band radiating circuit of above-mentioned design.
The example that amplifier 1 is used for amplifying signal is at first described.The desirable signal wave of importing in the GSM900 wave band is amplified by amplifier 1, and the output signal of amplifier 1 is delivered to signal combiner 6.Simultaneously, also produced harmonic components.Although amplifier 2 is not worked, because the output circuit optimization of amplifier 2 at the second harmonic frequency environs that is produced by amplifier 1, seems to produce no need radiated wave by amplifier 2.
The no need radiated wave that amplifier 2 output circuits leak out is input to BPF4 by power divider 3.The characteristic of BPF4 is set to extract composition in the frequency band identical with the second harmonic of the desired frequency of amplifier 1, and other frequency content that decays.Therefore, by the signal from amplifier 2 leakages of BPF4 decay except no need radiated wave.
The BPF4 output signal inputs to signal combiner 6 by phase regulator 5.Phase regulator 5 is regulated the phase place of BPF4 output signals so that the BPF4 phase of output signal becomes fully opposite with second harmonic composition phase place in amplifier 1 output signal in the signal combiner 6.Output signal after the phase adjusted is provided for signal combiner 6.
Signal combiner 6 merges the power magnitude of amplifier 1 output signal power amplitude and phase regulator 5 output signals, and the signal of output generation.Because the second harmonic in amplifier 1 output signal is opposite on phase place as mentioned above with phase regulator 5 output signals, these compositions are cancelled out each other when by signal combiner 6 they being merged.As a result, this composition is attenuated and exports.The output signal of signal combiner 6 is launched from antenna 9 by antenna multicoupler 8.
Then the example that amplifier 2 is used for amplification input signal will be described.The desired signal wave of the input in the DCS1800 wave band is amplified by amplifier 2, and the output signal of amplifier 2 inputs to LPF7 by power divider 3.LPF7 be limited in the DCS1800 wave band signal by and decay have than the high-frequency signal of high band.Launch from antenna 9 by antenna multicoupler 8 by the desired signal wave in the DCS1800 wave band of LPF7.In this way, no need radiated wave can be as being suppressed in custom circuit shown in Figure 2.
According to this embodiment, in having the radiating circuit of a plurality of emission bands, do not need can suppress harmonic components by combined signal on the change phase basis.This radiating circuit has reduced the interior fluctuation minimum of frequency band that the output level that is not limited to harmonic wave makes desirable output level decay simultaneously and occurs.Although phase regulator 5 and signal combiner 6 may consume some electric currents, amplifier 1 is compared insignificant with 2 current drain in this quantity and the actual design.
In the above-described embodiments, term " GSM900 " and " DCS1800 " represent the frequency band near 900MHz and 1800MHz respectively, do not represent the restriction according to system of the present invention.Similarly, in described embodiment, amplifier 1 is optimized in the GSM900 wave band.This is because because GSM regulation and universal amplifier characteristic make the second harmonic that suppresses GSM the most difficult technically., this The Application of Technology is not limited to GSM900.
The foregoing description demonstrated two amplifiers 1 with different emission bands and 2 double frequency-band radiating circuit., the present invention can be applied to have the radiating circuit of three or more different emission band amplifiers.In having the circuit of three or more amplifiers, if the no need radiated wave frequency band that first amplifier produces in conducting (ON) state is consistent with the emission band of second amplifier under (OFF) state of shutoff, can suppress the no need radiated wave that produces by first amplifier by design shown in Figure 1.Therefore, provide design to every pair amplifier with relation same as shown in Figure 1.
In the above-described embodiments, the second harmonic of the no need radiated wave that is produced by amplifier 1 is suppressed.In theory, as long as the emission band of second amplifier is consistent under the no need radiated wave frequency band that first amplifier produces under the ON state and the OFF state, just can suppress the harmonic wave outside the second harmonic.In the above-described embodiments, although hypothesis is used the power amplifier of being produced by for example GaAs, be not particularly limited semiconductor fabrication processes etc.
As the phase regulator among this embodiment 5, for example be assumed to be a delay line., this can be formed by active element etc.As signal combiner 6, for example, be assumed to be a frequency mixer.This is not limited to active circuit or passive circuit.This antenna 9 has the performance of transmitted power aloft.The present invention can use a wire antenna or a wireless aerial.
As mentioned above, according to the present invention, in the signal merging process that the signal combiner is carried out, can be suppressed at the no need radiated wave that amplifier produces under the ON state.As a result, do not need low pass filter is connected to the output of amplifier.This makes, and occurring in desired wave attenuation of inhibition and the emission band fluctuates becomes possibility.In addition, can expect to improve efficient owing to the stabilized load characteristic of amplifier self.In addition, can expect that the no need radiated wave level is reduced to is equal to or better than prior art.
Claims (4)
1. radiating circuit is characterized in that comprising:
First amplifier (1) and second amplifier (2), be used for the independent input signal that amplifies different emission bands, described first amplifier (1) produces unwanted radiated wave in a frequency band under conducting state, this frequency band is identical at the emission band under the off state with described second amplifier (2);
Band pass filter (4) is used in the same frequency band of the no need radiated wave that leaks out from described second amplifier, extracts a composition from the output signal of described first amplifier;
Phase regulator (5), the phase place of output signal that is used to regulate described band pass filter is so that opposite with phase place from the no need radiated wave of the output signal of described first amplifier; With
Signal combiner (6) is used for and will merges from the output signal of described phase regulator and output signal from described first amplifier.
2. according to the circuit of claim 1, further comprise:
Power divider (3) is used for and will carries out demultiplex from the output signal of described second amplifier to export one first signal and a secondary signal, and described first signal will be provided for described band pass filter;
A low pass filter (7) is used for from extracting desirable signal from the secondary signal of described power divider output; With
Antenna multicoupler (8) is used for selectivity and exports one of output signal from described signal combiner and described low pass filter.
3. method that suppresses no need radiated wave is characterized in that comprising step:
The emission band that first amplifier (1) and second amplifier (2) are set is so that consistent at the emission band under the off state with second amplifier at the frequency band of the no need radiated wave of first amplifier generation under the conducting state;
In the frequency band identical, from the output signal of first amplifier, extract a composition with the frequency band that leaks out no need radiated wave from second amplifier;
The phase place of regulating the signal component that extracts is so that opposite with the phase place of no need radiated wave in the output signal of first amplifier; With
With signal after the phase adjusted with merge from the output signal of first amplifier.
4. according to the method for claim 3, be characterised in that also to be included in the second amplifier duration of work is extracted desired signal by the output signal of demultiplex from second amplifier step.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000256790A JP2002076953A (en) | 2000-08-28 | 2000-08-28 | Transmission circuit and unwanted radiation suppression method |
| JP256790/2000 | 2000-08-28 | ||
| JP256790/00 | 2000-08-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1341997A CN1341997A (en) | 2002-03-27 |
| CN1135715C true CN1135715C (en) | 2004-01-21 |
Family
ID=18745342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011407883A Expired - Fee Related CN1135715C (en) | 2000-08-28 | 2001-08-28 | Transmitting circuit and no need radiated wave suppressing method |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6952566B2 (en) |
| JP (1) | JP2002076953A (en) |
| CN (1) | CN1135715C (en) |
| GB (1) | GB2371932B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4301401B2 (en) * | 2002-11-08 | 2009-07-22 | Ｔｄｋ株式会社 | Front-end module and communication terminal |
| US7030714B2 (en) * | 2003-10-01 | 2006-04-18 | Intel Corporation | Method and apparatus to match output impedance of combined outphasing power amplifiers |
| US7664461B2 (en) * | 2006-03-02 | 2010-02-16 | Broadcom Corporation | RFID reader architecture |
| US8285231B2 (en) * | 2009-06-09 | 2012-10-09 | Broadcom Corporation | Method and system for an integrated leaky wave antenna-based transmitter and on-chip power distribution |
| JP5758754B2 (en) * | 2011-09-09 | 2015-08-05 | 太陽誘電株式会社 | Electronic components |
| CN105932421A (en) * | 2016-05-31 | 2016-09-07 | 芜湖辉灿电子科技有限公司 | Mobile phone antenna capable of switching radiant emittance |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1389530A (en) | 1973-07-12 | 1975-04-03 | Standard Telephones Cables Ltd | Water purification |
| US4811422A (en) * | 1986-12-22 | 1989-03-07 | Kahn Leonard R | Reduction of undesired harmonic components |
| JPH02285725A (en) | 1989-04-26 | 1990-11-26 | Fujitsu Ltd | Improving method for interference between transmission and reception |
| JPH1141131A (en) | 1997-07-15 | 1999-02-12 | Toshiba Corp | Radio communication device |
| DE19823049C2 (en) * | 1998-05-22 | 2000-09-21 | Ericsson Telefon Ab L M | Power amplifier output circuit for suppressing harmonics for a mobile radio unit with double band operation and method for operating the same |
| JPH11355056A (en) | 1998-06-09 | 1999-12-24 | Mitsubishi Electric Corp | Higher harmonic suppressing method/circuit |
| JPH11355155A (en) | 1998-06-09 | 1999-12-24 | Toshiba Corp | Apc circuit and power distributor |
| US6366788B1 (en) * | 1998-07-08 | 2002-04-02 | Hitachi, Ltd. | Mobile telephone system |
-
2000
- 2000-08-28 JP JP2000256790A patent/JP2002076953A/en active Pending
-
2001
- 2001-08-27 US US09/938,586 patent/US6952566B2/en not_active Expired - Fee Related
- 2001-08-28 CN CNB011407883A patent/CN1135715C/en not_active Expired - Fee Related
- 2001-08-28 GB GB0120814A patent/GB2371932B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US20020032012A1 (en) | 2002-03-14 |
| GB2371932A (en) | 2002-08-07 |
| JP2002076953A (en) | 2002-03-15 |
| CN1341997A (en) | 2002-03-27 |
| GB2371932B (en) | 2003-04-16 |
| GB0120814D0 (en) | 2001-10-17 |
| US6952566B2 (en) | 2005-10-04 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040121 Termination date: 20130828 |